Here are some steps to help troubleshoot a laptop’s screen resolution:

1. Check to make sure that the laptop display is set to the correct resolution for the monitor – you may need to adjust the resolution if the picture is blurry
2. Check if the laptop monitor connection is properly placed in the display port – ensure that it is plugged in all the way and firmly
3. Check the cables between the laptop and the monitor and ensure that they are all securely connected – replace any cables that may be worn or fraying
4. Check to make sure that the correct monitor is selected as the primary display – you may need to adjust the settings in the Display Properties to specify the correct display
5. Verify that the monitor is turned on and functioning properly – if the monitor is off or not working properly, it will cause the display on the laptop to be off or to appear blurry